<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
    <title></title>
</head>
<body>
</body>
</html>
<?php
$name = 'Haoyuxuan';
echo $name . "\n";
echo "<br />";
var_dump($name);
echo "<br />";
$list = array('name'=>'zhangruoyun','id'=>151713375,'age'=>20);
var_dump($list);
echo "<br />";
$array = [
"foo" => "bar",
"bar" => "foo",
];
var_dump($array);
echo "<br />";
$a =10;
$b =2;
$c = $a + $b;
echo $c;
echo "<br />";
$d ='';
$e =0;
echo ($d==$e);
var_dump ($d===$e);
echo "<br />";
$output = `dir`;
echo "<pre>$output </pre>";
echo "<br />";
function p($str='')
{
    echo "<per>" . $str . "</pre>";
}
p($c);
p($name);
if ($a>4) {
    p('大于4');
}else{
    p('小于4')；
}
?>
</body>
</html>